Tip-enhanced broadband CARS spectroscopy and imaging using a photonic crystal fiber based broadband light source

Kentaro Furusawa, Norihiko Hayazawa, Francesca Celine Catalan, Takayuki Okamoto, Satoshi Kawata

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

Abstract

We report tip-enhanced broadband coherent anti-Stokes Raman scattering (CARS) spectroscopy and imaging based on a broadband light source using a photonic crystal fiber. Multiplexing from 900 cm -1 to 2200 cm -1 is achieved by optimizing the supercontinuum generation process at a high numerical aperture focus. By combining this system with a shear-force microscope, semiconducting carbon nanotubes are imaged with a spatial resolution of 60 nm. Our results show that tip-enhanced broadband CARS image exhibits a positive contrast even though the enhancement effect has not been fully optimized. Analyses of delay-dependent tip-enhanced broadband CARS spectra suggest the possibilities of multiple carrier interactions that uniquely occur at high intensities within the nanotubes.

Original languageEnglish
Pages (from-to)656-661
Number of pages6
JournalJournal of Raman Spectroscopy
Volume43
Issue number5
DOIs
Publication statusPublished - 2012 May

Keywords

  • broadband multiplex CARS
  • near-field microscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Spectroscopy

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